Given a number N, the task is to find the number of diagonals in N sided convex polygon.
Example 1:
Input: N = 5
Output: 5
Example 2:
Input: N = 6
Output: 9
Your Task:
You don't need to read input or print anything. Your task is to complete the function diagonals() which takes N as input and returns the number of possible diagonals.
Expected Time Complexity: O(1)
Expected Auxiliary Space: O(1)
Constraints:
3 ≤ N ≤ 10^{9}

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